Question

Which supporting detail from the passage would be most important to

include in a summary?
Until the 1800s, there was no such thing as standard time. Each local
town had its own time, based on the position of the sun over the town.
Times often differed between towns that were only a short distance
apart. In the United States, for instance, there were over 300 different
time systems
Why did this change? Railroads. With so many different times, it was
impossible for people to know when to catch the train Accidents even
resulted sometimes, when operators of trains using the same track
had different times on their clocks. So, to make train travel possible,
the world was divided into time zones, and times were standardized

Answer 1

So, to make train travel possible, the world was divided into time zones, and times were standardized.

Step-by-step explanation:

The above sentence is the supporting detail from the passage that would be most important to include in a summary. This is because it actually gives a conclusion and a solution to the problem of same time that had caused accidents. Also, this particular sentence captures the main idea of the passage which makes it possible for it to be included in the summary.